package com.hmall.getway.filters;

import cn.hutool.core.text.AntPathMatcher;
import com.hmall.getway.config.AuthProperties;
import com.hmall.getway.utils.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Component
@RequiredArgsConstructor
public class AuthGlobalFilter implements GlobalFilter, Ordered {


    private final AuthProperties authProperties;

    private  final JwtTool jwtTool;
    private  final AntPathMatcher antPathMatcher=new AntPathMatcher();
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
//获取用户信息
        ServerHttpRequest request = exchange.getRequest();

        //判断是否需要做登录拦截
        if (isExclude(request.getPath().toString())){
            return chain.filter(exchange);
        }
        //获取token
        String token=null;
        List<String> headers = request.getHeaders().get("Authorization");
        if (headers!= null &&!headers.isEmpty()) {
            token = headers.get(0);
        }

        //校验token
        Long userId=null;
        try {
             userId = jwtTool.parseToken(token);
        }catch (Exception e) {

            //token校验失败，返回401
            ServerHttpResponse response=exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //传递用户信息到下一个filter
        String userInfo=userId.toString();
        ServerWebExchange swe = exchange.mutate().request(builder -> builder.header("user-Info", userInfo))
                .build();

//放行
        return chain.filter(swe);
    }

    private boolean isExclude(String path) {
        for (String pathPattern : authProperties.getExcludePaths()) {
            antPathMatcher.match(pathPattern, path);
            if (antPathMatcher.match(pathPattern, path)) {
                return true;
            }
        }
        return false;
    }
    @Override
    public int getOrder() {
        return 0;
    }
}
